Optional sat-nav is expensive but its graphics and operation are excellent

Straightforward to use and pleasing to look at, the heating controls are a triumph in combining form and function

The sDrive35i matches the 0-62mph sprint we recorded for the old Z4 M Coupe

The twin-turbo straight six might lack the zing of a naturally-aspirated six, but it is flexible

The DCT auto' 'box has a launch control function. 0-30mph is covered in 2.2sec

The sDrive35i has a crackle at start-up and a metallic-edged bark under load

Ride feels composed with Drive Dynamic Control switched to Normal

All four gas dampers work independently and are continuously adjustable

The Z4's perceived quality is beyond criticism

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Despite tasking the new BMW Z4 with a broader remit that encompasses the softer side of roadster duties, BMW has not overlooked performance.

The range-starting sDrive20i and the sDrive28i are both excellent engines that complement the Z4 beautifully. They deliver a blend of pace and economy that BMW seems to be able to achieve consistently better than its rivals.

Underpinning that impressive performance is the now-familiar twin-turbo straight six, unchanged from its applications in the 1 Series and 3 Series. It may not have quite the same zingy top end as BMW’s naturally aspirated sixes, but as an engine to tackle the variety of conditions our congested roads present, it is difficult to fault. The efficiency of the DCT gearbox also contributes to the performance potential.

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At 335bhp, the 35iS has 33bhp more than the regular 35i. There are some visual tweaks but chassis changes are limited. Beyond a freer-flowing exhaust, there are no mechanical changes to the 35iS's motor over the 35i's. That's okay, because the turbocharged 3.0-litre six was already a stonker.

The way the 35iS picks up and pulls cleanly through its rev range is world-class, and now it comes with the kind of exhaust rasp that's been missing from the line-up since the demise of the old M3. Economy and emissions are on a par with the regular 35i, too.